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Old 06-27-2018, 07:37 PM   #1
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Onan Genset Thermostat Replacement in Seneca 36MS

I just finished changing the oil and filter on the Onan 8kw quiet diesel genset in my 2008 Seneca 36MS. While doing so, I started to wonder how I would change the thermostat when the time comes since the top access panel of the generator housing where the t-stat is located is not accessible because of the way the generator is mounted with no overhead access space. It looks like the only way to service the thermostat is to unbolt the entire generator mounting frame from the vehicle chassis and lower the entire frame and genset. That would probably require a service center with a special jacking/forklift system to perform the work. Seems like what would be a do-it-yourself $15.00 maintenance job just turned into $500plus... Has anyone had any experience with this??
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Old 06-27-2018, 08:43 PM   #2
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We don't have that experience but what you say is generally what would have to take place.
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Old 06-27-2018, 10:14 PM   #3
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Thanks for the quick reply! That's about the only way I can see a t-stat replacement being accomplished in my rig. Unfortunately, the thermostat will now be relegated to my "only replace upon failure" list. No preventative maintenance for this component other than a normal cooling system flush.
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Old 06-28-2018, 06:18 AM   #4
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Open the living room slide and look above the generator under the slide. There is a panel with two screws. I have not opened mine yet but I think that might be what it is for.
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Old 06-28-2018, 08:12 AM   #5
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Thank you for that suggestion. I was thinking about the very same possibility but I was unable to open the slide while in our storage space. I'll check it out next week on our trip to Yellowstone and report my findings.
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Old 06-30-2018, 12:56 PM   #6
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I just inspected above my Onan 8kw generator after extending the slide and there is no access panel above the genset. This means that the entire generator would need to be removed and lowered to replace the thermostat. Very poor installation design in my opinion. Normal maintenance, which would include thermostat replacement, should not require removing the generator and support frame in order to perform the maintenance.

My biggest mistake was not checking out the maintenance accessibility of all components before I made my purchase. I assumed the design engineers would have thought this out before installing a major auxiliary system such as a generator... :-(
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Old 06-30-2018, 01:21 PM   #7
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Quote:
Originally Posted by SurfnTurf View Post
I just inspected above my Onan 8kw generator after extending the slide and there is no access panel above the genset. This means that the entire generator would need to be removed and lowered to replace the thermostat. Very poor installation design in my opinion. Normal maintenance, which would include thermostat replacement, should not require removing the generator and support frame in order to perform the maintenance.

My biggest mistake was not checking out the maintenance accessibility of all components before I made my purchase. I assumed the design engineers would have thought this out before installing a major auxiliary system such as a generator... :-(
It's fairly common to have the generator mounted in a side-basement cabinet.
Our first motorhome from another manufacturer was exactly the same. In our second motorhome a DP it was mounted in the nose in a full pullout 'tray'.
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Old 06-30-2018, 02:45 PM   #8
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That nose slide in most DP motorhomes is a very handy place to install the genset. I'll be looking for that feature in our next RV.
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